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Influence of D. destructor and R. solani infestation of potato germs (the Janka variety), on their development, weight and СO₂ release was studied in the laboratory. Results of experiments indicate a possibility of pathogenic effects induced by D. destructor. They are manifested as germs weight reduction and increased CO₂ release, the latter recorded from the beginning of their vegetation.
Effect of 6 strains of F. oxysporum isolated from cysts of H. avenae (H-l) and G. rostochiensis (G-l, G-ll, G-12, G-13, G-14) on G. rostochiensis cysts were studied in vitro. Superficially sterilized cysts were placed in a medium (water agar with streptomycin) inoculated with fungi. The culture was kept at 20℃ for 3 months. All the F. oxysporum strains were found to parasitise eggs, the weakest being the isolate from H. avenae and strongest (more then 50% parasitized eggs) being strains G-l and G-ll; the latter two were additionally found to have plugged the cyst’s natural openings and damaged the cyst’s walls.
The studies were carried out on common reed (Phragmites australis) growing on the shores of Lake Glinno and forming rush communities of the alliance Phragmition. 10 plants with disease symptoms were gathered from each of five sites. The isolation and marking of pathogens were performed twice from fragments of leaf and blade tissues with disease symptoms. First, directly after collecting the plants incubated in sterile humid chambers and microorganism cultures on CDA and PDA medium, and then phytopathogen and saprotroph species occurring on dried green material were identified for 2-A months. The occurrence of 31 species of microscopic fungi overall was observed on the leaves, blades and inflorescences of P. australis, including 2 mycelia of Mycelia sterilia. The most frequently occurring species, present at all sites of Phragmites australis are: Alternaria alternata, Cladosporium cladosporioides, C. herbarum, Doratomyces stemonitis and Puccinia phragmitis, P. magnussiana and two mycelia of Mycelia sterilia. The most common species occurring on blades and inside them are: Acremoniella atra, Acremonium alternatum and Fusarium sambucinum. Sporadically, Ustilago grandis was also observed inside blades. Tiny necrotic stains on leaves and blades were caused by the presence of three species of the genus Leptoshaeria: L. culmifraga, L. eustoma and L. fuckelli. The occurrence of the sclerote of Claviceps microcephala was found in inflorescences.
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